BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, OCTOBER 8, 2021 ALL TIMES ARE IN EASTERN STANDARD TIME SUNRISE: 0549E SUNSET: 1713E A PLEASANT FALL DAY ATOP GREAT BLUE HILL.... Not much has changed since yesterday in the weather department. We again are experiencing mostly sunny skies and light winds. Temperatures are a few degrees cooler today, though, thanks to an onshore easterly flow yet still above average. Dew points remain in the low to mid-50s, which is anomalously warm for this time of year. As such, our overnight lows are where this month's warmth is occuring. The morning low both yesterday and today is 55, which is nearly 10 degrees above the norm. Visibility-wise, we began around 35 miles in the morning increasing to 65 miles by early afternoon. The high so far today is 69F, 5 degrees above the normal max of 64F. The low since midnight is 55F, 8 degrees above the normal low of 47F. -------------------------------------------------------------- PRELIMINARY STATS FOR SEPTEMBER 2021 TEMPERATURE, Deg. F Avg. Max. 73.2 [+0.5] Avg. Min. 57.4 [+1.8] Mean 65.3 [+1.1] 24-hour corrected mean: 64.8 Max. for month: 82F on the 15th Min. for month: 45F on the 29th HEATING DEGREE DAYS Total heating units: 46 [-54] Total for the season: 74 [-44] Total for last season: 98 COOLING DEGREE DAYS Total cooling units: 62 [-12] Total for the season: 714 [+44] Total for last season: 830 PRECIPITATION, Inches Total: 6.64 [+2.58] Greatest in 24 hrs: N/A WIND, mph Avg. uncorrected wind speed: 10.5 mph Avg. corrected wind speed: 11.0 mph Prevailing wind direction: NW [11%] Peak gust and direction: 49 ENE on the 2nd SUNSHINE: Campbell-Stokes card minutes: 11490 of a possible 21582, or 53% Astronomical total minutes: 11965 of a possible 22423, or 53% -------------------------------------------------------------- Today's Observations: 7 A.M. Weather: Scattered altocumulus (few cirrus disant S-WSW) Temperature: 58F; Dew Point: 54F; Relative Humidity: 87% Wind: NNE @ 9G14 kts Sea-level pressure: 1021.7 mb; 30.17 in. Hg: rising, then rising more rapidly Visibility: 35 miles, thin fog 6-hr Max temp: 58F 6-hr Min temp: 55F 24-hr Precip: 0.00 ins. BHO SA 1155 50 SCT 35 217/58/54/0209G14/017/ FEW CI DSNT S-WSW THN F ALQDS/ 8/031 53011 10058 20055 10 A.M. Weather: Clear (patch of AC/AS SSW-WNW) Temperature: 67F; Dew Point: 53F; Relative Humidity: 61% Wind: ENE @ 7G11kts Sea-level pressure: 1022.5 mb; 30.19 in Hg; rising, then increasing more slowly Visibility: 65 miles, hazy 3-hr Precip: 0.00 ins. BHO SA 1455 CLR 65 225/67/53/0708G11/019/ PTCH AC/AS SSW-WNW HAZY/ 8/030 51008 1 P.M. Weather: Clear (few cumulus distant SW-N) Temperature: 68F, Dew point: 52F; Relative Humidity: 57% Wind: ENE @ 8G13 kts Sea-level pressure: 1022.2 mb; 30.19 in Hg; falling unsteadily Visibility: 65 miles, hazy 6-hr Max temp: 73F 6-hr Min temp: 57F 6-hr Precip: 0.00 ins. BHO SA 1755 CLR 65 222/68/52/0708G13/019/ FEW CU DSNT SW-N HAZY/ 8/100 57003 10069 20058 SUMMARY FOR THURSDAY, OCTOBER 7, 2021 TEMPERATURE (DEGREES F) MAX.......73 NORMAL.....64 MIN.......55 NORMAL.....47 MEAN......64 NORMAL.....56 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL..............+8 TOTAL DEPARTURE FOR THE MONTH..........................+8 [+0.9 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022) TOTAL HEATING UNITS FOR YESTERDAY................1 DEPARTURE........-9 TOTAL HEATING UNITS FOR THE MONTH...............48 DEPARTURE.......-12 TOTAL HEATING UNITS FOR THE SEASON.............122 DEPARTURE.......-55 TOTAL HEATING UNITS LAST SEASON TO DATE........143 DEPARTURE.......-21 COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021) TOTAL COOLING UNITS FOR YESTERDAY................0 DEPARTURE.........0 TOTAL COOLING UNITS FOR THE MONTH................0 DEPARTURE........-4 TOTAL COOLING UNITS FOR THE SEASON.............714 DEPARTURE.......+40 TOTAL COOLING UNITS LAST SEASON TO DATE........831 DEPARTURE......-117 PEAK WIND GUST (MPH): Official...................15 WSW @ 9:57 P.M. AEROVANE (south tower).....15 W @ 1:47 A.M. VECTOR #2 (south tower)....16 @ 9:57 P.M. DAVIS #2 (south tower).....15 WSW @ 10:50 P.M. ASOS...........OUT OF SERVICE D/T RENOVATIONS VECTOR #1......OUT OF SERVICE D/T RENOVATIONS DAVIS #1.......OUT OF SERVICE D/T RENOVATIONS RMY............OUT OF SERVICE D/T RENOVATIONS MERLIN.........OUT OF SERVICE D/T RENOVATIONS FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL..................11 W @ 1:01 A.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE..............15 @ 9:57 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............12 W @ 12:57 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE.......OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE RMY AVERAGE........OUT OF SERVICE D/T RENOVATIONS AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL........ 6.0 W [144 total miles] VECTOR #2.................. 7.3 DAVIS #2................... 6.9 W RMY.................OUT OF SERVICE D/T RENOVATIONS ASOS................OUT OF SERVICE D/T RENOVATIONS VECTOR #1...........OUT OF SERVICE D/T RENOVATIONS DAVIS #1............OUT OF SERVICE D/T RENOVATIONS PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.......0.00 DEPARTURE....-0.17 TOTAL PRECIPITATION FOR THE MONTH.............2.08 DEPARTURE....+0.92 TOTAL PRECIPITATION FOR THE YEAR.............49.06 DEPARTURE....+9.49 PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST AERO: Aerovane wind recording system gust RMY: R.M. Young wind gust recording system TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized M: Missing data 09/01 68/56/62/-7/1.47/000/00 34 NNE AERO 37 NNE RMY N/A 09/02 71/55/63/-6/2.53/322/41 49 ENE AERO 52 ENE RMY N/A 09/03 72/52/62/-6/0.00/735/94 23 NW AERO 23 NW RMY N/A 09/04 76/55/66/-2/0.00/757/97 22 WNW AERO 21 WNW RMY N/A 09/05 72/60/66/-2/0.04/008/01 27 S AERO 29 S RMY N/A 09/06 80/61/71/+3/0.00/557/72 24 WNW AERO 25 WNW RMY N/A 09/07 78/57/68/+1/0.00/732/95 23 WSW AERO 22 WSW RMY N/A 09/08 81/61/71/+4/0.00/646/84 43 S AERO 45 S RMY N/A 09/09 71/64/68/+1/0.90/000/00 33 S AERO 36 S RMY N/A 09/10 74/55/65/-1/0.04/595/78 31 NW AERO 32 WNW RMY N/A 09/11 75/51/63/-3/0.00/730/96 24 SW AERO 24 SW RMY N/A 09/12 79/60/70/+4/0.00/591/78 33 SW AERO 32 SW RMY N/A 09/13 77/62/70/+5/0.06/559/74 22 NW AERO 23 NW RMY N/A 09/14 75/59/67/+2/0.00/444/59 23 S AERO 25 S RMY N/A 09/15 82/65/74/+9/T/539/72 32 SSW AERO 35 SSW RMY N/A 09/16 69/61/65/+1/0.27/037/05 24 ENE AERO 24 ENE RMY N/A TSTM 09/17 66/60/63/-1/0.02/000/00 22 NE AERO 23 NE RMY N/A 09/18 74/62/68/+5/0.04/207/28 17 WNW AERO 18 WNW RMY N/A TSTM 09/19 71/57/64/+1/0.15/619/84 23 NNE AERO 24 NNE RMY N/A 09/20 71/55/63/0/0.00/647/88 20 SE AERO 20 SE RMY N/A 09/21 75/55/65/+3/0.00/490/67 19 SSE AERO 20 SSE RMY N/A 09/22 75/65/70/+8/0.02/153/21 30 S AERO 30 S RMY N/A 09/23 78/65/72/+10/0.08/298/41 36 SSE AERO 37 SSE RMY N/A 09/24 75/62/69/+8/0.02/007/01 43 SSE AERO 45 SSE RMY N/A 09/25 74/59/67/+6/0.02/303/42 14 N AERO 14 NNW RMY N/A 09/26 73/54/64/+4/0.57/510/71 33 WNW AERO 32 WNW RMY N/A 09/27 73/52/63/+3/T/529/74 30 SW AERO 30 SW RMY N/A 09/28 67/52/60/+1/0.40/028/04 27 SSW AERO 25 SSW RMY N/A TSTM 09/29 63/45/54/-5/0.00/568/80 25 NNW AERO 25 NNW RMY N/A 09/30 60/46/53/-6/0.01/354/50 22 NNW AERO 21 NNW RMY N/A PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST AERO: Aerovane wind recording system gust RMY: R.M. Young wind gust recording system TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized M: Missing data 10/01 64/44/54/-4/0.00/.../.. 20 WNW AERO 20 WNW RMY N/A 10/02 73/47/60/+2/0.00/.../.. 24 WSW AERO 23 WSW RMY N/A 10/03 65/55/60/+3/0.09/.../.. 19 E AERO 19 E RMY N/A 10/04 59/51/55/-2/1.69/.../.. 30 E AERO 30 E RMY N/A 10/05 58/50/54/-3/0.30/.../.. 22 NNE AERO 23 NE RMY N/A 10/06 69/50/60/+4/..../.../.. 15 N AERO 16 N RMY N/A 10/07 73/55/64/+8/0.00/.../.. 15 WSW AERO 15 W RMY N/A 10/08 The low since midnight is 55F, the daily normal low is 47F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR OCTOBER 8 HIGH 81F IN 1916,1990 LOW 28F IN 1919 PRECIP 2.22 INCHES IN 1891 SNOWFALL TRACE IN 1988, 2001 (EARLIEST DATE) PEAK GUST 60 MPH NE IN 1996 RECORDS FOR OCTOBER 9 HIGH 82F IN 2011 LOW 29F IN 1907,1937 PRECIP 2.54 INCHES IN 1976 SNOWFALL TRACE IN 1988, 2001 PEAK GUST 81e MPH S IN 1976 (RECORD FOR MONTH) TODAY'S REPORT PREPARED BY: Andrew Swanson